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with these areas (e.g. providing ponded water for waterfowl) and the practice of winter time <br />diversions. <br />Rio Grande Compact <br />Because the Phase la model includes historic demand data, simulation of the Rio Grande <br />Compact is not required (e.g. stateline flows should reflect historic flows without imposing a <br />compact demand). Therefore a diversion station, which may be used for Compact administration <br />in a subsequent phase has been included in this phase of the model with zero demand. In <br />subsequent model development, the Compact delivery requirement will be represented using <br />forecasted inflows at Index gages. Additional information concerning Compact administration <br />may be found in a memorandum documenting discussions with the Division 3 Engineer. <br />Transmountain Diversions <br />There are several transmountain diversions in the San Luis Valley both exporting water from and <br />importing to the Rio Grande basin. All transbasin imports and exports are explicitly represented <br />in the surface water model. Those structures exporting water from the basin are represented with <br />efficiencies of 100 percent (no water returning to Rio Grande Basin). Structures which import <br />water to the basin are represented as inflow points, with the inflow amounts set equal to historical <br />time-series of diversion amounts. <br />Return Flows <br />Return flow data included in the Direct Diversion Station file include 1) the location where return <br />flows will accrue to the stream and 2) a delay table which describes when return flows will accrue <br />to the stream. The user may specify return flow locations by developing a return location file <br />(rg.rtn) that is read by the DMI watright and incorporates the information into the diversion <br />station file. Note that if data is not provided in the rg.rtn file, the next downstream node is <br />assumed. The timing patterns for these return flows are specified using a delay table (rg.dly) <br />which defines the fraction of the total returns occurring over a specified period of time (discussed <br />below). <br />Direct Diversion Right File <br />The Direct Diversion Right (rg. ddr) file contains water rights information for each structure in <br />the direct diversion station file, rg.dds. The rg.ddr file is created using the DMI watrightto <br />extract the State Engineer's official water rights tabulation contained in HydroBase. In addition, <br />several commands are used to set, replace or otherwise modify water right information in the <br />model input file. Attachment 2 contains the rg.ddr file with the command files echoed at the top <br />of this input file. <br />Closed Basin Deliveries <br />Diversion stations in the Rio Grande model requiring special set or replacement commands <br />included the diversion stations that deliver Closed Basin Project water to the Alamosa National <br />Wildlife Refuge and the Blanca Wildlife Habitat Area, and diversion stations diverting from <br />Costilla Creek located in New Mexico. Diversion stations diverting Closed Basin Project water <br />were assigned very senior water right priorities to insure they are allowed to divert from the <br />Closed Basin Canal are not called out by a downstream user. They were assigned a water right to <br />C:Acdss\Task6-7.doc Prepare Diversion Files November 04, 1999 -Page 3 of 6 <br />